V/Fe is approximately decreased from bottom to top, negatively correlated with S, and can be used to indicate the relative proportion of Fe-oxyhydroxides and Fe-sulfides, with V/Fe low and S high peaks at layers 8-11cm, 23-25cm, indicating that these two layers are relatively rich Fe-Sulfides, Poor Fe-oxyhydroxides, so that they are green-brown.
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